Theorem psubclssatN 40696

Description: A closed projective subspace is a set of atoms. (Contributed by NM, 25-Jan-2012.) (New usage is discouraged.)

Hypotheses

Ref	Expression
psubclssat.a	⊢ 𝐴 = (Atoms‘𝐾)
psubclssat.c	⊢ 𝐶 = (PSubCl‘𝐾)

Assertion

Ref	Expression
psubclssatN	⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → 𝑋 ⊆ 𝐴)

Proof of Theorem psubclssatN

Step	Hyp	Ref	Expression
1		psubclssat.a	. . 3 ⊢ 𝐴 = (Atoms‘𝐾)
2		eqid 2763	. . 3 ⊢ (⊥𝑃‘𝐾) = (⊥𝑃‘𝐾)
3		psubclssat.c	. . 3 ⊢ 𝐶 = (PSubCl‘𝐾)
4	1, 2, 3	psubcliN 40693	. 2 ⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → (𝑋 ⊆ 𝐴 ∧ ((⊥𝑃‘𝐾)‘((⊥𝑃‘𝐾)‘𝑋)) = 𝑋))
5	4	simpld 499	1 ⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → 𝑋 ⊆ 𝐴)

Syntax hints:   → wi 4   ∧ wa 400   = wceq 1570   ∈ wcel 2143   ⊆ wss 3906  ‘cfv 6538  Atomscatm 40018  ⊥_𝑃cpolN 40657  PSubClcpscN 40689

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5258  ax-nul 5270  ax-pow 5338  ax-pr 5406

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-opab 5175  df-mpt 5194  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-iota 6494  df-fun 6540  df-fv 6546  df-psubclN 40690

This theorem is referenced by:  pmapidclN  40697  psubclinN  40703  paddatclN  40704  pclfinclN  40705  poml6N  40710  osumcllem3N  40713  osumcllem9N  40719  osumcllem11N  40721  osumclN  40722